I want to believe you meant 700 participants and even if its 7000 you need to have serious financial backing for reputable managers to take you serious because for this to be managed effectively, you will need nothing less than 25 managers based on my calculations and getting that will involved the big names, medium names and the upcoming managers.

The bringing together those big wits will mean enough funds in escrow, serious vetting of your proposed project, enough investigations among others. But if its going to be in tokens, it might be less strenuous because some managers would willingly avoid it but be sure not to attract attention with that massive proposal.